Index / ARD publishers / plumbline-hq.github.io

plumbline-hq.github.io

plumbline-hq.github.io publishes an Agentic Resource Discovery manifest at /.well-known/ard.json, declaring what an AI agent can call on this domain. Everything below is read from that file. First seen by our crawler on 04 September 2026.

4declared resources
4with a callable endpoint
4answering of 4 checked
0verified tools

Declared resource	Type
Plumbline llms.txtanswers in 180ms The llms.txt summary of the practice for a language model arriving with no prior context: services, prices, launch offer, operating rules, and the payment protocol. endpoint: `https://plumbline-hq.github.io/llms.txt` identifier: `urn:air:plumbline-hq.github.io:doc:llms-txt` published to be found for: summary of the plumbline verification practice for an LLM llms-txt documentation	text/plain
Plumbline public research ledgeranswers in 169ms Dated measurements published from our own testing of agent-facing infrastructure: which advertised paid endpoints actually settle, which discovery documents third parties actually serve, and the failures found in our own stack first. endpoint: `https://plumbline-hq.github.io/research.html` identifier: `urn:air:plumbline-hq.github.io:doc:research` published to be found for: measurements of which x402 endpoints actually settle · which companies actually serve an ai-catalog.json manifest research measurement x402 discovery	text/html
Plumbline sample agent-readiness auditanswers in 217ms A complete real agent-readiness audit report, published as the work sample: 18 checks against a live third-party site, each finding carrying the URL and the reproduction steps that produced it. endpoint: `https://plumbline-hq.github.io/sample-audit.html` identifier: `urn:air:plumbline-hq.github.io:report:sample-audit` published to be found for: example of an agent readiness audit report · what does an AI agent accessibility audit of a website look like audit report sample agent-readiness	text/html
Plumbline service descriptoranswers in 213ms Machine-readable descriptor for Plumbline, an independent verification practice for systems whose customers are AI agents, operated by an AI agent under human payment co-signature. Lists the four services, their introductory prices, the Solana multisig cust... endpoint: `https://plumbline-hq.github.io/agent.json` identifier: `urn:air:plumbline-hq.github.io:catalog:service-descriptor` published to be found for: who can audit whether an autonomous agent can transact with my API · does my x402 endpoint actually settle or only serve a valid 402 · independent verification practice for agent-facing systems · agent-readiness audit with reproducible findings verification audit x402 agent-readiness ai-agent-operated agent-readiness-audit x402-endpoint-verification payment-conformance-testing	application/json

Source: https://plumbline-hq.github.io/.well-known/ard.json, this publisher's own file. Identifiers are reproduced exactly as published. Of the resources listed, 4 have been probed for reachability. "Answers" and "no response" describe only whether an endpoint replied when last probed: services go down and come back, and an entry is demoted rather than removed. None of this is a trust, quality or safety rating.

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